High Flow Cats and O2 sensor
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High Flow Cats and O2 sensor
Hello, im looking to install high flow cats
https://www.rpmoutlet.com/powercats.htm
My concern is it would appear that the rear O2 sensors are directly in the stock cats. It seems my options are:
1.Get the HF cats and drill a bung in the pipe after the cats and install O2 sensor (still throw a code?)
2. Get the HF cats and do nothing with O2 sensor and get tune (fail emissions still)?
3. Leave stock cats because of PIA!!!
I have 80k on truck and have removed resonators with a cutout. Looking for a little more sound and possibly performance without jumping into headers.
Thanks.
https://www.rpmoutlet.com/powercats.htm
My concern is it would appear that the rear O2 sensors are directly in the stock cats. It seems my options are:
1.Get the HF cats and drill a bung in the pipe after the cats and install O2 sensor (still throw a code?)
2. Get the HF cats and do nothing with O2 sensor and get tune (fail emissions still)?
3. Leave stock cats because of PIA!!!
I have 80k on truck and have removed resonators with a cutout. Looking for a little more sound and possibly performance without jumping into headers.
Thanks.
Laughing Gas
Joined: Jun 2013
Posts: 1,026
Likes: 23
As I understand it the rear(cat) O2 sensors do nothing but tell the computer if the cats are doing their job, hence the 'cat below threshold efficiency' code for removing them. So I would think in theory having the sensor right after the aftermarket cats shouldn't throw a code as long as those high flow cats are actually doing what they are supposed to.
Any aftermarket tune or tuner like a SCT can simply turn the rear O2 sensors off and no codes.
I run no cats with no codes with an aftermarket custom tune. And have no issues with the truck whatsoever.
We have no emission testing here. Woohoo, true north strong and free!
Any aftermarket tune or tuner like a SCT can simply turn the rear O2 sensors off and no codes.
I run no cats with no codes with an aftermarket custom tune. And have no issues with the truck whatsoever.
We have no emission testing here. Woohoo, true north strong and free!
Postmaster
Joined: Jul 2015
Posts: 4,392
Likes: 22
From: very South Texas
just go with the headers, hf cats... sensor kits. or be happy with what you have now.
bits at a time.. end up costing a lot more. at the finish line.
and talk to the company that make the headers... for there choice of cats and sensors.. they have already done the work...
bits at a time.. end up costing a lot more. at the finish line.
and talk to the company that make the headers... for there choice of cats and sensors.. they have already done the work...
Laughing Gas
Joined: Jun 2013
Posts: 1,026
Likes: 23
I don't find my exhaust raspy at all and I'm familiar with what it is as I used to have a 350z with no cats as well and that sucker was raspy. The truck is tame. A little louder at start up and under WOT but dead quiet at a warm idle and under normal driving conditions. No drone whatsoever. The rest of my exhaust is stock and I'm hesitant to pull out a resonator/muffler as I dislike cab noise at highway speeds.
I don't think there's much of anything to be gained on these trucks with shorty headers, similar to the 5.4's. My manifolds don't leak and I'd never willingly open that potential can of worms. I've had headers on other motors and always end up getting to know the gasket install and torque procedure too well it seems.
I don't think there's much of anything to be gained on these trucks with shorty headers, similar to the 5.4's. My manifolds don't leak and I'd never willingly open that potential can of worms. I've had headers on other motors and always end up getting to know the gasket install and torque procedure too well it seems.
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Senior User
Joined: Oct 2015
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I agree with shorty headers. so if i did it it would be long and that is expensive an all fronts. I think i will try the HF cats and weld a bung down pipe. If the rear O2 sensors are just there to tell if the cat is working correctly, then i can always get a tune to disable them.
Laughing Gas
Joined: Jun 2013
Posts: 1,026
Likes: 23
Yup. Mytruckruns flawlessly with the rear o2's disabled. No codes, and turned off in a custom tune done by a speed shop up here that has their own dynos. Lightspeed innovations in Red Deer. I have also noticed it as an option on the SCT 'canned tunes' to disable rear O2 sensors.
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Laughing Gas
Joined: Sep 2005
Posts: 984
Likes: 8
Hate to drum up a dead post, but you are wasting your money. This isn't the 70s, your stock cats will outflow a stock engine especially with stock manifolds. Removing them will increase noise and that's about it and cause you greif if you have emissions inspections.
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Laughing Gas
Joined: Sep 2005
Posts: 984
Likes: 8
I don't follow numbers for the 6.2 because I don't really care to. My point to you is you are likely wasting your money on a set of converters because of 1 person's opinion. Forced induction this would be a different story. To truely compare converters you need to know the cell count of the substrate, surface area, diameter and so on. Until you know what is in there stock, the aftermarket set could actually flow worse. If you are that worried about all out performance lose them. Anything in the exhaust system is a restriction, pipe length, bends, mufflers, converters, you get the idea. In the end even if you cut them off you aren't going to notice the 10 horsepower it gained on the top end, especially in a truck.
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